Portion of a mailbox



FIG. 1 is a perspective view of a portion of a mailbox showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The surface shading illustrated in the drawings is provided merely to highlight the contour of design; it is not intended to be illustrative of texture or gloss.

The evenly spaced broken lines immediately adjacent to the claim represent the bounds of the claimed design. The broken lines form no part of the claimed design. 

CLAIM The ornamental design for a portion of a mailbox, as shown and described. 